Dependency of protoc is added.

pom.xml

@@ -17,6 +17,7 @@
 
     <properties>
         <grpc.version>1.2.0</grpc.version>
+        <protoc.version>3.2.0</protoc.version>
         <spring-test-version>4.3.9.RELEASE</spring-test-version>
         <hibernate.version>4.3.10.Final</hibernate.version>
         <spring-data-jpa>1.11.4.RELEASE</spring-data-jpa>
@@ -120,7 +121,7 @@
             <extension>
                 <groupId>kr.motd.maven</groupId>
                 <artifactId>os-maven-plugin</artifactId>
-                <version>1.4.1.Final</version>
+                <version>1.5.0.Final</version>
             </extension>
         </extensions>
 
@@ -130,7 +131,7 @@
                 <artifactId>protobuf-maven-plugin</artifactId>
                 <version>0.5.0</version>
                 <configuration>
-                    <protocArtifact>com.google.protobuf:protoc:3.2.0:exe:${os.detected.classifier}</protocArtifact>
+                    <protocArtifact>com.google.protobuf:protoc:${protoc.version}:exe:${os.detected.classifier}</protocArtifact>
                     <pluginId>grpc-java</pluginId>
                     <pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
                 </configuration>
@@ -142,6 +143,13 @@
                         </goals>
                     </execution>
                 </executions>
+                <dependencies>
+                    <dependency>
+                        <groupId>com.google.protobuf</groupId>
+                        <artifactId>protobuf-java</artifactId>
+                        <version>${protoc.version}</version>
+                    </dependency>
+                </dependencies>
             </plugin>
 
         </plugins>